Skip to main content

Protostar Stack4

About

Stack4 takes a look at overwriting saved EIP and standard buffer overflows.

This level is at /opt/protostar/bin/stack4

Hints

  • A variety of introductory papers into buffer overflows may help.
  • gdb lets you do “run < input”
  • EIP is not directly after the end of buffer, compiler padding can also increase the size.

Source code

(stack4.c) download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16

#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>

void win()
{
  printf("code flow successfully changed\n");
}

int main(int argc, char **argv)
{
  char buffer[64];

  gets(buffer);
}